Coming in before going out again? (5)
I believe the answer is:
tidal
'coming' is the definition.
Although both the answer and definition are adjectives, I don't see how one could define the other.
'in before going out again?' is the wordplay.
'in' indicates putting letters inside.
'before' becomes ''til' (I've seen this in another clue).
'going out again?' becomes 'da' (I can't justify this - if you can you should believe this answer much more).
'til' placed around 'da' is 'TIDAL'.
Can you help me to learn more?
(Other definitions for tidal that I've seen before include "Relating to sea rise/fall" , "Relating to ocean surges" , "subject to regular surges" , "To do with sea movements of lunar origin" , "__ wave; tsunami" .)